Use Windows Live Messenger and give back

Use Windows Live Messenger and give back

If you use Live Messenger 8.1, you can now easily give back to one of nine (currently) available charities. By adding a special code to your name in IM, a new icon will appear and a portion of the ad revenue generated will be donated to the charity of your choice. Here's a blog post with more detail.

Note that this ability is currently limited to US citizens, but there are plans to extend it to other countries.